The commonsense rules of the "real world" are a fragile collection of socially reinforced illusions.

When you try to do something big its hard to fail completely.

Never check email first thing in the morning. Instead, complete your most important task before 11:00 A.M. to avoid using lunch or reading email as a postponement excuse.

The best way to improve mental performance, is to improve physical performance

Which 20% of sources are causing 80% of my problems and unhappiness? Which 20% of sources are resulting in 80% of my desired outcomes and happiness?

It is predicated on the assumption that you dislike what you are doing during the most physically capable years of your life. This is a nonstarter—nothing can justify that sacrifice.

Awareness, even at a subconscious level, beats fancy checklists without it, track or you will fail.